US4526002A - Exhaust relief system - Google Patents

Exhaust relief system Download PDF

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Publication number
US4526002A
US4526002A US06/565,422 US56542283A US4526002A US 4526002 A US4526002 A US 4526002A US 56542283 A US56542283 A US 56542283A US 4526002 A US4526002 A US 4526002A
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United States
Prior art keywords
exhaust
exhaust system
engine
passageway
manifold
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US06/565,422
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English (en)
Inventor
Lawrence C. Bibow
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Brunswick Corp
Original Assignee
Brunswick Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Brunswick Corp filed Critical Brunswick Corp
Priority to US06/565,422 priority Critical patent/US4526002A/en
Assigned to BRUNSWICK CORPORATION reassignment BRUNSWICK CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: BIBOW, LAWRENCE C.
Priority to JP1984155655U priority patent/JPS60107317U/ja
Priority to SE8406527A priority patent/SE457945B/sv
Application granted granted Critical
Publication of US4526002A publication Critical patent/US4526002A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/12—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 specially adapted for submerged exhausting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/08—Other arrangements or adaptations of exhaust conduits
    • F01N13/085—Other arrangements or adaptations of exhaust conduits having means preventing foreign matter from entering exhaust conduit
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00—Other engines
    • F02B75/02—Engines characterised by their cycles, e.g. six-stroke
    • F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
    • F02B2075/027—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle four
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B61/00—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing
    • F02B61/04—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing for driving propellers
    • F02B61/045—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing for driving propellers for marine engines

Definitions

  • This invention relates to exhaust systems for marine engines and particularly to such engines arranged to discharge exhaust underwater.
  • All internal combustion engines can develop low pressure in their exhaust systems under certain conditions.
  • the low pressure can result during the period of overlap of the intake and exhaust valve or from reverse rotation of the engine, for example.
  • the low pressure in the exhasut system can cause water to be forced into the engine, thereby seriously damaging the engine.
  • valves in the exhaust system to block the flow of water into the exhaust system. Though such valves have proven generally satisfactory in exhaust systems having cooling water injected into the exhaust stream upstream of the valve, they have been susceptible to damage if the engine is operated even briefly without cooling water. Without the cooling water, the exhaust can reach temperatures high enough to damage the valve.
  • the invention provides a vacuum relief means connected to the exhaust system of a four-cycle engine which discharges the engine exhaust underwater.
  • the vacuum relief means acts to relieve any vacuum created in the exhaust system, thus preventing water from entering the engine through the exhaust system.
  • the vacuum relief means may include a one-way valve to allow flow into the exhaust system to relieve any vacuum created therein.
  • the vacuum relief means includes a passageway connecting the exhaust system to the intake manifold.
  • the one-way valve is placed in the passage to allow flow from the intake manifold to the exhaust system when a vacuum arises in the exhaust system. This arrangement is particularly helpful should reverse rotation of the engine occur, causing a high pressure in the intake manifold and a low pressure in the exhaust system.
  • FIG. 1 is a side view partially in section showing a stern drive incorporating the present invention.
  • FIG. 2 is an end view of the engine used in the stern drive of FIG. 1.
  • FIG. 3 is a cross-sectional view of a valve used in the device of FIGS. 1 and 2.
  • a stern drive 10 having an engine 11 mounted on the inside of a hull of a boat 12 and connected to drive an outboard propulsion unit 13 attached to the stern of the boat 12.
  • the engine 11 is a four-cycle engine which draws in air-fuel mixture from a carburetor 14 through an intake manifold 15 and into the engine 11 where it is burned in the cylinders to drive the engine 11. From the cylinders the exhaust gases are discharged into an exhaust manifold 16. From the exhaust manifold 16 the exhaust exits through an exhaust elbow 17 and passes downwardly into the outboard propulsion unit 13. An exhaust passageway 18 is formed through the outboard propulsion unit 13 and discharges through the propeller 19 or other underwater opening, in a well known manner.
  • the engine illustrated is cooled by fresh water taken in through the outboard propulsion unit 13 and circulated through a heat exchanger 20, though the engine could be directly cooled by the fresh water.
  • the fresh water is conducted through a passage 21 to the cooling jacket 22 of an exhaust elbow 17.
  • the cooling water exits the cooling jacket 22 through an opening 24 into the exhaust passageway 18 and is mixed with the exhaust from the engine 11.
  • the fresh water in the heat exchanger 20 is used to cool the engine coolant which is circulated through the engine block and exhaust manifold 16.
  • the inlet to the connecting passage 25 is provided by a fitting 26 provided on the intake manifold 15.
  • the outlet of the passage 25 is a fitting 27 on the exhaust elbow 17.
  • the fitting on the exhaust elbow 17 passes through the water jacket 22 to the main exhaust passage 18.
  • a one-way valve 28 connected between the fittings 26 and 27 by hoses prevents flow from the exhaust elbow 17 to the inlet manifold 15.
  • the body of the valve 29 includes a valve seat 30 formed internally.
  • a valve member 31 is against signal the valve seat 30 by a spring 32.
  • the spring 32 is sized allow the valve to open before sufficient suction occurs in the exhaust manifold 16 to draw water up the exhaust passageway 18 and into the engine 11.
  • the exhaust system will have a higher pressure than the inlet manifold 15 during all conditions when the engine is operating.
  • the higher pressure in the exhaust system will thus hold the relief valve 28 closed and there will be no connection between the exhaust manifold 16 and the inlet manifold 16.
  • the low pressure in the exhaust system would be communicated to the relief valve 28 causing it to open. With the relief valve 28 open, air from the intake manifold would be communicated to the exhaust system to relieve the low pressure. Thus, water would not be drawn up the exhaust system into the engine 11.
  • the invention thus provides a relief system which protects the engine from the inadvertent admittance of water into the engine through the exhaust system. Further, with the relief valve installed in the engine in accordance with the invention the requirement of a valve in the exhaust system to prevent the entrance of water into the exhaust system can be eliminated.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Silencers (AREA)
US06/565,422 1983-12-27 1983-12-27 Exhaust relief system Expired - Lifetime US4526002A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US06/565,422 US4526002A (en) 1983-12-27 1983-12-27 Exhaust relief system
JP1984155655U JPS60107317U (ja) 1983-12-27 1984-10-15 排気逃がし装置
SE8406527A SE457945B (sv) 1983-12-27 1984-12-20 Utblaasningsutjaemningssystem

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US06/565,422 US4526002A (en) 1983-12-27 1983-12-27 Exhaust relief system

Publications (1)

Publication Number Publication Date
US4526002A true US4526002A (en) 1985-07-02

Family

ID=24258524

Family Applications (1)

Application Number Title Priority Date Filing Date
US06/565,422 Expired - Lifetime US4526002A (en) 1983-12-27 1983-12-27 Exhaust relief system

Country Status (3)

Country Link
US (1) US4526002A (sv)
JP (1) JPS60107317U (sv)
SE (1) SE457945B (sv)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4972809A (en) * 1988-04-14 1990-11-27 Sanshin Kogyo Kabushiki Kaisha Power unit of inboard/outboard
FR2729916A1 (fr) * 1995-01-31 1996-08-02 Gutmann Messtechnik Ag Entrainement pour bateaux et navires
WO1997023383A1 (en) * 1995-12-22 1997-07-03 Ab Volvo Penta Seawater and exhaust system in an engine installation in a boat
US5761904A (en) * 1994-03-28 1998-06-09 Honda Giken Kogyo Kabushiki Kaisha Air inlet structure for exhaust passage in engine
US6077137A (en) * 1999-01-08 2000-06-20 Volvo Penta Of The Americas, Inc. Anti ingestion device
US6648338B1 (en) 2002-03-15 2003-11-18 Brunswick Corporation Exhaust gasket with individually sealed water passages
US6652337B1 (en) 2002-03-15 2003-11-25 Brunswick Corporation Exhaust system for a marine propulsion engine
US6921307B2 (en) * 2001-05-21 2005-07-26 Yamaha Marine Kabushiki Kaisha Exhaust system for outboard motor
US7387556B1 (en) 2006-03-01 2008-06-17 Brunswick Corporation Exhaust system for a marine propulsion device having a driveshaft extending vertically through a bottom portion of a boat hull
US8317557B2 (en) 2010-10-04 2012-11-27 Brunswick Corporation Anti-ingestion system for a marine drive
US8628364B2 (en) 2010-05-25 2014-01-14 Honda Motor Co., Ltd. Outboard motor
US8651908B1 (en) 2010-10-04 2014-02-18 Brunswick Corporation Anti-ingestion system for a marine drive
US9302756B1 (en) 2014-05-27 2016-04-05 Brunswick Corporation Stern drives and flywheel housings for stern drives
US9481439B1 (en) 2014-12-04 2016-11-01 Brunswick Corporation Stern drives having vibration isolation
CN107503834A (zh) * 2017-09-15 2017-12-22 张竞博 大功率拖拉机外延型排气管

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3552121A (en) * 1967-12-25 1971-01-05 Yanmar Diesel Engine Co Means for preventing reverse water flow through exhaust pipe of a rotary piston type marine engine
US3921398A (en) * 1973-08-10 1975-11-25 Outboard Marine Corp Exhaust manifold with high rise water tube

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3552121A (en) * 1967-12-25 1971-01-05 Yanmar Diesel Engine Co Means for preventing reverse water flow through exhaust pipe of a rotary piston type marine engine
US3921398A (en) * 1973-08-10 1975-11-25 Outboard Marine Corp Exhaust manifold with high rise water tube

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4972809A (en) * 1988-04-14 1990-11-27 Sanshin Kogyo Kabushiki Kaisha Power unit of inboard/outboard
US5761904A (en) * 1994-03-28 1998-06-09 Honda Giken Kogyo Kabushiki Kaisha Air inlet structure for exhaust passage in engine
FR2729916A1 (fr) * 1995-01-31 1996-08-02 Gutmann Messtechnik Ag Entrainement pour bateaux et navires
WO1997023383A1 (en) * 1995-12-22 1997-07-03 Ab Volvo Penta Seawater and exhaust system in an engine installation in a boat
US6077137A (en) * 1999-01-08 2000-06-20 Volvo Penta Of The Americas, Inc. Anti ingestion device
WO2000040463A1 (en) * 1999-01-08 2000-07-13 Volvo Penta Of The Americas, Inc. Anti ingestion device
US6921307B2 (en) * 2001-05-21 2005-07-26 Yamaha Marine Kabushiki Kaisha Exhaust system for outboard motor
US6652337B1 (en) 2002-03-15 2003-11-25 Brunswick Corporation Exhaust system for a marine propulsion engine
US6648338B1 (en) 2002-03-15 2003-11-18 Brunswick Corporation Exhaust gasket with individually sealed water passages
US7387556B1 (en) 2006-03-01 2008-06-17 Brunswick Corporation Exhaust system for a marine propulsion device having a driveshaft extending vertically through a bottom portion of a boat hull
US8628364B2 (en) 2010-05-25 2014-01-14 Honda Motor Co., Ltd. Outboard motor
US8317557B2 (en) 2010-10-04 2012-11-27 Brunswick Corporation Anti-ingestion system for a marine drive
US8651908B1 (en) 2010-10-04 2014-02-18 Brunswick Corporation Anti-ingestion system for a marine drive
US9302756B1 (en) 2014-05-27 2016-04-05 Brunswick Corporation Stern drives and flywheel housings for stern drives
US9481439B1 (en) 2014-12-04 2016-11-01 Brunswick Corporation Stern drives having vibration isolation
CN107503834A (zh) * 2017-09-15 2017-12-22 张竞博 大功率拖拉机外延型排气管

Also Published As

Publication number Publication date
JPS60107317U (ja) 1985-07-22
SE8406527D0 (sv) 1984-12-20
SE457945B (sv) 1989-02-13
SE8406527L (sv) 1985-06-28

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Owner name: BRUNSWICK CORPORATION ONE BRUNSWICK PLAZA, SKOKIE,

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